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The CDL general knowledge test is required to be taken by all CDL applicants. The Mississippi CDL test consists of 50 questions. To pass, you must correctly answer at least 40 questions (80%). The general knowledge test covers the contents of the Mississippi CDL Manual. All CDL applicants (Class A, B and C) must study the following sections: Driving Safely, Transporting Cargo Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Vehicle Inspection Test, Basic Control Skills Test, Road Test. In addition, the Class A CDL test will include questions based on the Combination Vehicles section. Take this CDL practice test now to prepare for the actual MS general knowledge test! To get your CDL, you must pass both the knowledge and skills tests. CDL knowledge tests include: General Knowledge, Passenger Transport, Air Brakes, Combination Vehicles, Hazardous Materials, Tanker Vehicles, Doubles/Triples, School Bus, Firefighter. Depending on what class of license (A, B or C) and endorsements you need, you must take one or more knowledge tests. A special endorsement is also required to drive certain types of vehicles. The following endorsements may be used with a Class A, B or C CDL: HazMat (H), Tank Vehicles (N), Tank Vehicles Transporting Hazardous Materials (X) and Passenger Transport (P). The School Bus endorsement (S) is only available for Class A or B CDL, and the Doubles/Triples endorsement (T) is only available for Class A driver's licenses.
1. Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
The weight of a cargo
Repaving of the road
2. In a dual air brake system, if one air system is very low on pressure:
you should pump the brakes to restore pressure.
the effect won't be noticeable for the first 50 miles.
either the front or rear brakes will not be operating fully.
you should drive and brake as you always have.
3. When driving on wet roads, you should:
reduce speed by 60%.
pull of the road and get some rest.
reduce speed by about one-third.
follow the vehicle ahead more closely than under ideal driving conditions.
4. On wet roads, you must drive slower to be able to stop in the same distance as on a dry road. Reduce speed by about _______ when driving on a wet road.
70 percent
60 percent
5. When using double clutching to shift gears, if you are having difficulty putting the vehicle into the next gear you should:
force the lever until you put the vehicle into the next gear.
reduce the engine speed to drop back to the previous gear.
prevent the transmission from shifting up beyond the selected gear.
return to neutral, release the clutch, increase the engine speed to match the road speed, and try again.
6. To correct a drive-wheel braking skid, you should:
fully apply the brakes until you stop.
stop braking and countersteer.
steer into the skid.
release the clutch and press the accelerator at the same time, then countersteer.
7. The spring brakes come on:
when air pressure in both air brake systems rises to a value set by the manufacturer.
when you lose ABS control.
when you bring the vehicle to a complete stop right away.
when main air pressure is lost.
8. Water in the brakes can cause the brakes to:
be weak or apply unevenly.
9. When driving at night, you should use ________ when you can.
emergency flashers
indicator lights
low beams
high beams
10. At dawn, dusk, in rain or snow, to make yourself easier to see you should:
use the low beams.
use the emergency flashers.
use the high beams.
use the parking lights.
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MS CDL Practice Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
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